Radiator Hose Clamp Markings

[A26B]

We have had several requests over the last couple of years, for the original radiator hose clamps. Virtually all of my stock was acquired in boxes of take-off parts, so I don't know which year they might have come from.

Now, I have a customer needing the clamps for a specific year model, but I don't know which markings were on the different year models.

So, I need to access the knowledge of the Registry and build a database for the NCRS guys. If your ZR-1 still has the original spring style clamps on the radiator hoses, please look at as many of them as possible, 6 hoses/12 clamps, & poat the year model, which hose and the number or letter code stamped into the clamp.

example of data needed
1991, Radiator Outlet Hose, Stamped "V"
1991, Radiator Inlet Hose, Stamped ....
etc. Note, may be a letter or a number stamping.

Thanks for looking and posting. Here's an example clamp.
http://jerrysgaskets.com/store2/root/images/10158012-U.jpg

[We Gone]

I have a box of them from my 90 & 91 I will dig them out and look, But I have on idea who came from what

[XfireZ51]

I have some that came off both my 92s

[A26B]

I have a box of them from my 90 & 91 I will dig them out and look, But I have on idea who came from what

Well, at least it will be narrowed down to only 2 model years. I will take any data I can get and reduce it when possible. Thanks for looking.

[A26B]

I have some that came off both my 92s

Thanks for looking & the information when you can obtain it.

[efnfast]

Wouldn't NCRS have this info? If they don't, then does it matter? I'll check mine this evening Jerry.

[efnfast]

The ones I could see without mirrors or inspection camera's on my 90 were all stamped with an "S". The clamp on the bottom of the t tube had a small hole where the letter would have been stamped. Most of the clamps up high, in the line of sight were black, the out of site clamps were galvanized colored. -Steve

[A26B]

Wouldn't NCRS have this info? If they don't, then does it matter? I'll check mine this evening Jerry.

I am not familiar with NCRS. One of my customers wanted clamps specifically for the 1991 and I do not know what that might be. To him it matters, so I am just trying to accomodate. Thanks for looking.

[A26B]

The ones I could see without mirrors or inspection camera's on my 90 were all stamped with an "S". The clamp on the bottom of the t tube had a small hole where the letter would have been stamped. Most of the clamps up high, in the line of sight were black, the out of site clamps were galvanized colored. -Steve

Just to be sure of the data I'm compiling, is the following accurate? Please cut, paste & edit as needed.
Thanks again.

1990, Coolant Outlet to X-over Pipe Hose, "S"
1990, X-over Pipe to Rad Inlet Hose, "S"
1990, X-over Pipe to Bypass Hose, Unknown
1990, Rad Outlet to T-Stat Hsng Hose, None visible, hole in tang
1990, T-Stat Hsng to Water Pump Hose, Unknown

[efnfast]

Just to be sure of the data I'm compiling, is the following accurate? Please cut, paste & edit as needed.
Thanks again.

1990, Coolant Outlet to X-over Pipe Hose, "S"
1990, X-over Pipe to Rad Inlet Hose, "S"
1990, X-over Pipe to Bypass Hose, Unknown
1990, Rad Outlet to T-Stat Hsng Hose, None visible, hole in tang
1990, T-Stat Hsng to Water Pump Hose, Unknown

I'm at work, and the car is at home, soooooo, you'll have to wait until tonight to get an answer.

[A26B]

I'm at work, and the car is at home, soooooo, you'll have to wait until tonight to get an answer.
Dang! I hate it when folks have to work.;)
Sure do appreciate the assist.

[We Gone]

All from 90 taken off at 20k miles

1990, X-over Pipe to Rad Inlet Hose, "T" X-over end had a screw clamp from Germany Had tag on it
1990, X-over Pipe to Bypass Hose, Gray clamp with hole
1990, Rad Outlet to T-Stat Hsng Hose, None visible, hole in tang
1990, T-Stat Hsng to Water Pump Hose, Housing end black clamp "X"
Made in Germany Screw Clamp markings NOHMR 32-50

unfortunately I don't have the originals off my 91 I sent an OEM kit to Marc and he changed them not sure if he used the clamps in the kit or put the originals back on.

[A26B]

All from 90 taken off at 20k miles

1990, X-over Pipe to Rad Inlet Hose, "T" X-over end had a screw clamp from Germany Had tag on it
1990, X-over Pipe to Bypass Hose, Gray clamp with hole
1990, Rad Outlet to T-Stat Hsng Hose, None visible, hole in tang
1990, T-Stat Hsng to Water Pump Hose, Housing end black clamp "X"
Made in Germany Screw Clamp markings NOHMR 32-50

unfortunately I don't have the originals off my 91 I sent an OEM kit to Marc and he changed them not sure if he used the clamps in the kit or put the originals back on.

That's interesting. I've never paid a lot of attention to the radiator hose clamps before, but sure didn't know worm gear clamps were used in that application, especially randomly.

All of the other hose clamp applications I have examined, have been marked "CANADA TRIDON ALL STAINLESS".

This is good info that will someday provide useful information for restorers. Keep it coming. =D>

[WVZR-1]

In the service TSB hose & clamp package the one worm clamp

Made in Germany Screw Clamp markings NOHMR 32-50

is also included.

[Jagdpanzer]

Jerry,
Here are the factory installed hose clamps that came off my 94 #390

http://i540.photobucket.com/albums/gg333/pwasinger/photo1_zps9e81598a.jpg

http://i540.photobucket.com/albums/gg333/pwasinger/photo2_zps81b92dff.jpg

http://i540.photobucket.com/albums/gg333/pwasinger/photo3_zps1cf36da1.jpg

[A26B]

Phil, the engineer in you is showing up..........big time!! Thank you.

[Scrrem]

Phil,
You obviously had some free time on your hands today.....LOL!!!
Rich

[jrd1990zr1]

Jerry,

I'll check my NCRS manual to see what they say about the clamps and report back.

John

[A26B]

Jerry,

I'll check my NCRS manual to see what they say about the clamps and report back.

John

That would be great. Thanks. IF I remember correctly, NCRS checked the hose clamps for the correct date stamping on C2's. So, I'm just drawing on that recollection & assuming the stampings on the ZR-1 clamps may be similarly important.

[A26B]

In the service TSB hose & clamp package the one worm clamp

Made in Germany Screw Clamp markings NOHMR 32-50

is also included.

Any thoughts on the reasoning behind a single, odd clamp?

[We Gone]

http://imageshack.com/a/img856/9350/967p.jpg

[jrd1990zr1]

That would be great. Thanks. IF I remember correctly, NCRS checked the hose clamps for the correct date stamping on C2's. So, I'm just drawing on that recollection & assuming the stampings on the ZR-1 clamps may be similarly important.

Jerry,

According to the NCRS manual.

"The 1990 ZR-1 Corvettes with serial number 00019 to 00913 have radiator hose clamps of a worm gear design. All the radiator clamps used are of the same configuration and manufacturer." It goes on to talk about the manufacturer "Tridon", country of origin is Canada. As part of a recall the worm clamps were replaced with spring clamps due to leak conditions.

It also says "The 1990 ZR-1 Corvettes after serial number 0914 and all 1991 ZR-1 Corvettes have radiator hose clamps of a spring ring type and are gray or gray-black in color."

I do not see any notations regarding markings on the spring type clamps.

Both my 1990 ZR-1 #2124 and #2529 had the spring type clamps all around.

Hope this helps, John

[jrd1990zr1]

http://imageshack.com/a/img856/9350/967p.jpg
I think this might have been one of the clamps provided in the service replacement hose and clamp kit.

[goriffle]

My 90 has the screw clamps. Its #0768

[A26B]

Jerry,

According to the NCRS manual.

"The 1990 ZR-1 Corvettes with serial number 00019 to 00913 have radiator hose clamps of a worm gear design. All the radiator clamps used are of the same configuration and manufacturer." It goes on to talk about the manufacturer "Tridon", country of origin is Canada. As part of a recall the worm clamps were replaced with spring clamps due to leak conditions.

It also says "The 1990 ZR-1 Corvettes after serial number 0914 and all 1991 ZR-1 Corvettes have radiator hose clamps of a spring ring type and are gray or gray-black in color."

I do not see any notations regarding markings on the spring type clamps.

Both my 1990 ZR-1 #2124 and #2529 had the spring type clamps all around.

Hope this helps, John

Very much so John. Thanks. I'm going to keep adding any info that comes my way in case something develops later.

[taximan]

94-95 NCRS manual also states:

"All 1994 and 1995 ZR1 Corvettes have radiator hose clamps of a spring ring type and are gray or gray-black in color."

No mention of letter or date codes.

[Jetjock]

Jerry, I have a 92 and a 93 ZR-1 and the same as above. No hose clamps markings.